Automatic Room Light Controller Circuit and Applications Home Automation with Automatic Room Light Controller Automatic Room Light Controller with a Visitor Counter. This system is designed by using two sets of IR transmitters and receivers. These IR sensors are placed in such a way that they detect a person entering and leaving the room to turn the home appliances. Automatic Room Lighting System using Microcontroller Jun 16, 2017Automatic Room Lighting with Bidirectional Visitor Counter can be used to automatically turn on the light in a room when a person enters the room and turn it off when the person leaves the room. The project can also be dubbed as a Bidirectional Visitor Counter it is an integral part of the Automatic Room Lighting circuit.